Test Catalog Search Home Test Catalog Search Testing Choices: From the standard to the extraordinary × Search Clear Filter by: Clear all Method(s) Gas Chromatography/Mass Spectrometry (GC/MS) (1) Sample Type Blood (1) Test Area Exposure (1) Test Category Antacids (3) (-) Gases (1) NPS/Designer Drugs (3) Test Sub-Category (-) Hydrocarbons (1) Test Test Name 2745B Methane, Blood